Hi @lykkemedia , this plugin does not explicitly set a port for sending. It is an abstraction of the wp_mail() function built into WordPress. I believe the standard port for wp_mail is the standard SMTP port which is 587.
@lykkemedia Could this be related to the issues with logging in? We still couldn’t recreate that on this end and the error you sent was because of an empty body or an inability to connect with a cURL request to a remote server. I’d still like to fix the issue since that shouldn’t be fatal (should handle it gracefully) but I’m curious if this is all related.